Sufiyan Khan · Senior Software Engineer
Backend-focused engineer building reliable platforms and AI tooling, with active contributions to two widely used open-source projects.
Profile
Product judgment backed by production ownership.
I have grown from associate to senior engineer while owning mobile, backend, platform, and AI initiatives. My best work sits where reliability, developer experience, and measurable product outcomes meet.
Core Stack
Work Experience
4 years at one company,
leveling up every year
From associate to senior, shipping production systems at scale across mobile, backend, and AI — each role a deliberate step up in scope and ownership.
Senior Software Engineer
- Built an LLM-powered code review assistant using tool-calling workflows to automate security, performance, and style checks, reducing PR review turnaround from 2 days to 4 hours.
- Architected a centralized audit logging and activity tracking system, improving operational visibility across hotel workflows and reducing manual support effort.
- Built a real-time monitoring and alerting pipeline for critical booking and payment services, improving incident response across backend systems.
Software Engineer
- Redesigned report exports into an asynchronous, S3-backed workflow with background processing, user notifications, and automated retention policies, eliminating UI blocking during large data exports.
- Built a self-serve OTA Mapping platform using Node.js, MongoDB, and React, reducing operational dependency on support teams by 30%.
- Led development of a shared React component library and common utilities to standardize UI patterns and accelerate feature delivery across teams.
Associate Software Engineer
- Migrated a large-scale legacy Ionic-Angular application to React Native, modernizing the mobile stack and ensuring a seamless transition for 70,000+ users.
- Architected a real-time webhook event pipeline for reservation lifecycle events, decoupling monolith dependencies and reducing inter-service latency by 40%.
- Implemented biometric authentication using Face ID, Touch ID, and JWT-based session management to strengthen mobile security while reducing login friction.
Open Source
Open source. Built and contributed.
Authoring focused developer tools and shipping fixes to infrastructure-scale projects.
Active Contributorships
netbird
WireGuard-based overlay network platform. Fixed duplicate JWT group claims, guarded group deletion against active references, preserved user state across IdP sync cycles, corrected OpenAPI spec collisions, fixed Dex template handling, added OIDC groups scope for generic providers.
cline
AI coding agent in IDE & terminal. Configurable MCP init timeout, disabled bash in plan mode, token-budget error surfacing, persistent CLI settings, slash-command autocomplete for skills, draft preservation on mode toggle, LM Studio API key integration, telemetry & MCP server fixes across SDK, CLI, and VS Code extension.
Authored Packages
injection-guard
Detect and sanitize prompt injection attacks in LLM applications. TypeScript-first with zero dependencies — drop it in before any prompt hits your model.
envproof
Validate environment variables at startup with typed, clear error messages. Prevents silent misconfigurations from ever reaching production.
backoffkit
Retry decorator with exponential backoff and jitter. Works with both sync and async functions out of the box. Zero dependencies.
llm-fallback
Automatic LLM provider fallback with circuit breaker pattern. Keeps your AI features running when a provider goes down. TypeScript-first, zero dependencies.
Projects
Things I've built
Production systems and side projects — from LLM agents and hotel platforms to a mobile CRM that hit #1 on the Play Store.
LLM Code Review Agent
An AI-powered code review assistant that uses tool-calling workflows to automate security, performance, and style checks across pull requests. Reduced average PR review turnaround from 2 days to 4 hours, freeing engineers to focus on architecture decisions instead of mechanical checks.
TailorPlus: Fashion CRM
CRM for tailors & fashion designers. 5,000+ organic Play Store installs and ranked #1 in its category.
OTA Mapping Platform
Self-serve platform for hotel operators to manage OTA channel mappings, cutting support dependency by 30%.
Publications
Technical writing
31 articles published on Scaler Topics covering JavaScript, Java, and web fundamentals — written to explain concepts clearly, not just correctly.
Contact
Let's work together
I'm actively exploring senior engineering roles in Germany and across the EU. If you're building a product, scaling infrastructure, or shipping AI features, I'd love to connect.